Effect of Sc on As-Cast Microstructures and Mechanical Properties of Al-Si-Mg-Cu-Ti Alloys

Abstract:

The as-cast microstructures and mechanical properties of Al-Si-Mg-Cu-Ti alloys with and without Sc were investigated by metallographic microscope, field emission scanning electron microscope, energy spectrum analysis, transmission electron microscope and universal testing machine. The result shows that adding 0.20wt.% Sc into the casting alloy can refine the grain, change the growth morphology from dendrite to fine equiaxed grain, and the morphology of eutectic Si by rough laminar structure into fine fibrous. The tensile strength of alloy with 0.20wt.% Sc is up to 304.4 MPa after T6 heat treated, which is close to that of 6061 forging aluminum alloy.

• Periodical: Key Engineering Materials (Volume 732)
• Pages: 32-37
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.732.32
• Online since: March 2017
• Authors: Ming He Wang, Xiao Dong Du*, Yu Kun Li, Zhen Zhang, Hai Lin Su, Yu Cheng Wu
• Keywords: Al-Si-Mg-Cu-Ti, Mechanical Properties, Microstructure, Sc, T6 Heat Treatment

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